Sawtooth Oscillation in Current-Carrying Plasma in the Large Helical Device

Y. Nagayama, K. Kawahata, S. Inagaki, B. J. Peterson, S. Sakakibara, K. Tanaka, T. Tokuzawa, K. Y. Watanabe, N. Ashikawa, H. Chikaraishi, M. Emoto, H. Funaba, M. Goto, Y. Hamada, K. Ichiguchi, K. Ida, H. Idei, T. Ido, K. Ikeda, S. ImagawaA. Isayama, M. Isobe, A. Iwamoto, O. Kaneko, S. Kitagawa, A. Komori, S. Kubo, R. Kumazawa, S. Masuzaki, K. Matsuoka, T. Mito, J. Miyazawa, T. Morisaki, S. Morita, O. Motojima, S. Murakami, T. Mutoh, S. Muto, N. Nakajima, Y. Nakamura, H. Nakanishi, K. Narihara, Y. Narushima, A. Nishimura, K. Nishimura, A. Nishizawa, N. Noda, S. Ohdachi, K. Ohkubo, N. Ohyabu, Y. Oka, M. Osakabe, T. Ozaki, A. Sagara, K. Saito, R. Sakamoto, M. Sasao, K. Sato, T. Seki, T. Shimozuma, M. Shoji, H. Suzuki, S. Sudo, K. Takahata, Y. Takeiri, K. Toi, K. Tsumori, H. Yamada, I. Yamada, K. Yamazaki, N. Yanagi, M. Yokoyama, Y. Yoshimura, Y. Yoshinuma, T. Watari

Research output: Contribution to journalArticle

Abstract

Sawtooth oscillations have been observed in current-carrying helical plasmas by using electron-cyclotron-emission diagnostics in the Large Helical Device. The plasma current, which is driven by neutral beam injection, reduces the [Formula presented] threshold of the sawtooth oscillation. When the central [Formula presented] value is increased due to the plasma current, the core region crashes, and, when it is decreased, the edge region crashes annularly. Observed rapid mixture of the plasma in the limited region suggests that these sawtooth crashes are reconnection phenomena. Unlike previous experiments, no precursor oscillation has been observed.

Original languageEnglish
Number of pages1
JournalPhysical Review Letters
Volume90
Issue number20
DOIs
Publication statusPublished - Jan 1 2003

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crashes
plasma currents
oscillations
beam injection
neutral beams
cyclotrons
thresholds
electrons

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Nagayama, Y., Kawahata, K., Inagaki, S., Peterson, B. J., Sakakibara, S., Tanaka, K., ... Watari, T. (2003). Sawtooth Oscillation in Current-Carrying Plasma in the Large Helical Device. Physical Review Letters, 90(20). https://doi.org/10.1103/PhysRevLett.90.205001

Sawtooth Oscillation in Current-Carrying Plasma in the Large Helical Device. / Nagayama, Y.; Kawahata, K.; Inagaki, S.; Peterson, B. J.; Sakakibara, S.; Tanaka, K.; Tokuzawa, T.; Watanabe, K. Y.; Ashikawa, N.; Chikaraishi, H.; Emoto, M.; Funaba, H.; Goto, M.; Hamada, Y.; Ichiguchi, K.; Ida, K.; Idei, H.; Ido, T.; Ikeda, K.; Imagawa, S.; Isayama, A.; Isobe, M.; Iwamoto, A.; Kaneko, O.; Kitagawa, S.; Komori, A.; Kubo, S.; Kumazawa, R.; Masuzaki, S.; Matsuoka, K.; Mito, T.; Miyazawa, J.; Morisaki, T.; Morita, S.; Motojima, O.; Murakami, S.; Mutoh, T.; Muto, S.; Nakajima, N.; Nakamura, Y.; Nakanishi, H.; Narihara, K.; Narushima, Y.; Nishimura, A.; Nishimura, K.; Nishizawa, A.; Noda, N.; Ohdachi, S.; Ohkubo, K.; Ohyabu, N.; Oka, Y.; Osakabe, M.; Ozaki, T.; Sagara, A.; Saito, K.; Sakamoto, R.; Sasao, M.; Sato, K.; Seki, T.; Shimozuma, T.; Shoji, M.; Suzuki, H.; Sudo, S.; Takahata, K.; Takeiri, Y.; Toi, K.; Tsumori, K.; Yamada, H.; Yamada, I.; Yamazaki, K.; Yanagi, N.; Yokoyama, M.; Yoshimura, Y.; Yoshinuma, Y.; Watari, T.

In: Physical Review Letters, Vol. 90, No. 20, 01.01.2003.

Research output: Contribution to journalArticle

Nagayama, Y, Kawahata, K, Inagaki, S, Peterson, BJ, Sakakibara, S, Tanaka, K, Tokuzawa, T, Watanabe, KY, Ashikawa, N, Chikaraishi, H, Emoto, M, Funaba, H, Goto, M, Hamada, Y, Ichiguchi, K, Ida, K, Idei, H, Ido, T, Ikeda, K, Imagawa, S, Isayama, A, Isobe, M, Iwamoto, A, Kaneko, O, Kitagawa, S, Komori, A, Kubo, S, Kumazawa, R, Masuzaki, S, Matsuoka, K, Mito, T, Miyazawa, J, Morisaki, T, Morita, S, Motojima, O, Murakami, S, Mutoh, T, Muto, S, Nakajima, N, Nakamura, Y, Nakanishi, H, Narihara, K, Narushima, Y, Nishimura, A, Nishimura, K, Nishizawa, A, Noda, N, Ohdachi, S, Ohkubo, K, Ohyabu, N, Oka, Y, Osakabe, M, Ozaki, T, Sagara, A, Saito, K, Sakamoto, R, Sasao, M, Sato, K, Seki, T, Shimozuma, T, Shoji, M, Suzuki, H, Sudo, S, Takahata, K, Takeiri, Y, Toi, K, Tsumori, K, Yamada, H, Yamada, I, Yamazaki, K, Yanagi, N, Yokoyama, M, Yoshimura, Y, Yoshinuma, Y & Watari, T 2003, 'Sawtooth Oscillation in Current-Carrying Plasma in the Large Helical Device', Physical Review Letters, vol. 90, no. 20. https://doi.org/10.1103/PhysRevLett.90.205001
Nagayama, Y. ; Kawahata, K. ; Inagaki, S. ; Peterson, B. J. ; Sakakibara, S. ; Tanaka, K. ; Tokuzawa, T. ; Watanabe, K. Y. ; Ashikawa, N. ; Chikaraishi, H. ; Emoto, M. ; Funaba, H. ; Goto, M. ; Hamada, Y. ; Ichiguchi, K. ; Ida, K. ; Idei, H. ; Ido, T. ; Ikeda, K. ; Imagawa, S. ; Isayama, A. ; Isobe, M. ; Iwamoto, A. ; Kaneko, O. ; Kitagawa, S. ; Komori, A. ; Kubo, S. ; Kumazawa, R. ; Masuzaki, S. ; Matsuoka, K. ; Mito, T. ; Miyazawa, J. ; Morisaki, T. ; Morita, S. ; Motojima, O. ; Murakami, S. ; Mutoh, T. ; Muto, S. ; Nakajima, N. ; Nakamura, Y. ; Nakanishi, H. ; Narihara, K. ; Narushima, Y. ; Nishimura, A. ; Nishimura, K. ; Nishizawa, A. ; Noda, N. ; Ohdachi, S. ; Ohkubo, K. ; Ohyabu, N. ; Oka, Y. ; Osakabe, M. ; Ozaki, T. ; Sagara, A. ; Saito, K. ; Sakamoto, R. ; Sasao, M. ; Sato, K. ; Seki, T. ; Shimozuma, T. ; Shoji, M. ; Suzuki, H. ; Sudo, S. ; Takahata, K. ; Takeiri, Y. ; Toi, K. ; Tsumori, K. ; Yamada, H. ; Yamada, I. ; Yamazaki, K. ; Yanagi, N. ; Yokoyama, M. ; Yoshimura, Y. ; Yoshinuma, Y. ; Watari, T. / Sawtooth Oscillation in Current-Carrying Plasma in the Large Helical Device. In: Physical Review Letters. 2003 ; Vol. 90, No. 20.
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title = "Sawtooth Oscillation in Current-Carrying Plasma in the Large Helical Device",
abstract = "Sawtooth oscillations have been observed in current-carrying helical plasmas by using electron-cyclotron-emission diagnostics in the Large Helical Device. The plasma current, which is driven by neutral beam injection, reduces the [Formula presented] threshold of the sawtooth oscillation. When the central [Formula presented] value is increased due to the plasma current, the core region crashes, and, when it is decreased, the edge region crashes annularly. Observed rapid mixture of the plasma in the limited region suggests that these sawtooth crashes are reconnection phenomena. Unlike previous experiments, no precursor oscillation has been observed.",
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T1 - Sawtooth Oscillation in Current-Carrying Plasma in the Large Helical Device

AU - Nagayama, Y.

AU - Kawahata, K.

AU - Inagaki, S.

AU - Peterson, B. J.

AU - Sakakibara, S.

AU - Tanaka, K.

AU - Tokuzawa, T.

AU - Watanabe, K. Y.

AU - Ashikawa, N.

AU - Chikaraishi, H.

AU - Emoto, M.

AU - Funaba, H.

AU - Goto, M.

AU - Hamada, Y.

AU - Ichiguchi, K.

AU - Ida, K.

AU - Idei, H.

AU - Ido, T.

AU - Ikeda, K.

AU - Imagawa, S.

AU - Isayama, A.

AU - Isobe, M.

AU - Iwamoto, A.

AU - Kaneko, O.

AU - Kitagawa, S.

AU - Komori, A.

AU - Kubo, S.

AU - Kumazawa, R.

AU - Masuzaki, S.

AU - Matsuoka, K.

AU - Mito, T.

AU - Miyazawa, J.

AU - Morisaki, T.

AU - Morita, S.

AU - Motojima, O.

AU - Murakami, S.

AU - Mutoh, T.

AU - Muto, S.

AU - Nakajima, N.

AU - Nakamura, Y.

AU - Nakanishi, H.

AU - Narihara, K.

AU - Narushima, Y.

AU - Nishimura, A.

AU - Nishimura, K.

AU - Nishizawa, A.

AU - Noda, N.

AU - Ohdachi, S.

AU - Ohkubo, K.

AU - Ohyabu, N.

AU - Oka, Y.

AU - Osakabe, M.

AU - Ozaki, T.

AU - Sagara, A.

AU - Saito, K.

AU - Sakamoto, R.

AU - Sasao, M.

AU - Sato, K.

AU - Seki, T.

AU - Shimozuma, T.

AU - Shoji, M.

AU - Suzuki, H.

AU - Sudo, S.

AU - Takahata, K.

AU - Takeiri, Y.

AU - Toi, K.

AU - Tsumori, K.

AU - Yamada, H.

AU - Yamada, I.

AU - Yamazaki, K.

AU - Yanagi, N.

AU - Yokoyama, M.

AU - Yoshimura, Y.

AU - Yoshinuma, Y.

AU - Watari, T.

PY - 2003/1/1

Y1 - 2003/1/1

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AB - Sawtooth oscillations have been observed in current-carrying helical plasmas by using electron-cyclotron-emission diagnostics in the Large Helical Device. The plasma current, which is driven by neutral beam injection, reduces the [Formula presented] threshold of the sawtooth oscillation. When the central [Formula presented] value is increased due to the plasma current, the core region crashes, and, when it is decreased, the edge region crashes annularly. Observed rapid mixture of the plasma in the limited region suggests that these sawtooth crashes are reconnection phenomena. Unlike previous experiments, no precursor oscillation has been observed.

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